Consideration in contract law is the value or benefit given by each party in exchange for the other party’s value or benefit—such as money in exchange for products or services, or mutual promises exchanged.

Consideration is often referred to as the bargained-for exchange in which one consideration is exchanged for another consideration.

A mere promise to do or refrain from doing something that lacks consideration in the form of a value or benefit provided by the other party (a return promise) is not a contract and is generally not enforceable. One exception to this rule may be if one party promises to do or refrain from doing something, and the second party relies on that promise to its detriment (by spending money, for example), the detrimental reliance may create an enforceable contract.

And if the consideration for a contract is so insubstantial that it is worthless, the contract is said to be illusory and is not enforceable.

The existence of consideration is what distinguishes an enforceable contract from a promise to make a gift. Because a gift is a voluntary, gratuitous transfer of property from one person to another—without something of value promised in return—the failure to fulfill a promise to make a gift is not enforceable as a breach of contract, as there is no consideration for the promise to make the gift.

In Alabama, as in other states, consideration is a fundamental element of a legally binding contract. Consideration refers to something of value that is exchanged between parties entering into a contract. It can be a promise, an act, a benefit, or a detriment that the parties agree to exchange. Alabama law requires that each party must provide consideration to the other for a contract to be enforceable. This means that both parties must either benefit or suffer a legal detriment as a result of the contract. A contract without consideration, or with consideration that is deemed to be illusory or so insubstantial as to be considered worthless, is generally not enforceable in Alabama. However, Alabama recognizes the doctrine of promissory estoppel, which means that if one party makes a promise and the other party relies on that promise to their detriment, the promise may be enforced even without consideration. This is to prevent injustice due to the relying party's reasonable and detrimental reliance on the promise. Nonetheless, promises to make a gift, without more, are not enforceable as contracts in Alabama because they lack consideration.